Fix detecting end of result set paging.

sleekxmpp/plugins/xep_0059/rsm.py

@@ -13,6 +13,7 @@ from sleekxmpp import Iq
 from sleekxmpp.plugins.base import base_plugin
 from sleekxmpp.xmlstream import register_stanza_plugin
 from sleekxmpp.plugins.xep_0059 import Set
+from sleekxmpp.exceptions import XMPPError
 
 
 log = logging.getLogger(__name__)
@@ -70,19 +71,30 @@ class ResultIterator():
         elif self.start:
             self.query[self.interface]['rsm']['after'] = self.start
 
-        r = self.query.send(block=True)
+        try:
+            r = self.query.send(block=True)
 
-        if not r or not r[self.interface]['rsm']['first'] and \
-           not r[self.interface]['rsm']['last']:
+            if not r[self.interface]['rsm']['first'] and \
+               not r[self.interface]['rsm']['last']:
+                raise StopIteration
+
+            if r[self.interface]['rsm']['count'] and \
+               r[self.interface]['rsm']['first_index']:
+                count = int(r[self.interface]['rsm']['count'])
+                first = int(r[self.interface]['rsm']['first_index'])
+                num_items = len(r[self.interface]['substanzas'])
+                if first + num_items == count:
+                    raise StopIteration
+            
+            if self.reverse:
+                self.start = r[self.interface]['rsm']['first']
+            else:
+                self.start = r[self.interface]['rsm']['last']
+
+            return r
+        except XMPPError:
             raise StopIteration
 
-        if self.reverse:
-            self.start = r[self.interface]['rsm']['first']
-        else:
-            self.start = r[self.interface]['rsm']['last']
-
-        return r
-
 
 class xep_0059(base_plugin):